American Standard Version
This is the disciple that beareth witness of these things, and wrote these things: and we know that his witness is true.

Amplified® Bible
It is this same disciple who is bearing witness to these things and who has recorded (written) them; and we [well] know that his testimony is true.

Contemporary English Version
This disciple is the one who told all of this. He wrote it, and we know he is telling the truth.

Darby English Version
This is the disciple who bears witness concerning these things, and who has written these things; and we know that his witness is true.

Good News Bible
He is the disciple who spoke of these things, the one who also wrote them down; and we know that what he said is true.

International Standard Version
This is the disciple who is testifying to these things and has written them down. We know that his testimony is true.

King James Version
This is the disciple which testifieth of these things, and wrote these things: and we know that his testimony is true.

New American Standard Bible
This is the disciple who is testifying to these things and wrote these things, and we know that his testimony is true.

New International Version
This is the disciple who testifies to these things and who wrote them down. We know that his testimony is true.

New King James Version
This is the disciple who testifies of these things, and wrote these things; and we know that his testimony is true.

N.A.S.B. in E-Prime
This disciple testifies to these things and wrote these things, and we know that his testimony proves true.

Young's Literal Translation
this is the disciple who is testifying concerning these things, and he wrote these things, and we have known that his testimony is true.

New English Translation
This is the disciple who testifies about these things and has written these things, and we know that his testimony is true.